arXiv 1601.020272016-01-08hep-ph

共振区Drell-Yan过程的主导$\mathcal{O}(α_sα)$修正

Dominant $\mathcal{O}(α_sα)$ corrections to Drell-Yan processes in the resonance region

Stefan Dittmaier, Alexander Huss, Christian Schwinn

备注：: 16 pages, 6 figures, to appear in the proceedings of the 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (Radiative Corrections for the LHC and Future Colliders), UCLA Department of Physics & Astronomy Los Angeles, USA, 2015

摘要：

除了对强子对撞机上W玻色子和Z玻色子产生的著名的NNLO QCD和NLO电弱修正外，最重要的固定阶修正是由$\mathcal{O}(α_sα)$的混合QCD-电弱修正给出的。这些修正的知识是特别重要的，以控制在即将到来的高精度测量的W玻色子质量和有效的弱混合角在大型强子对撞机的理论不确定性。由于这些观测量占主导地位的相空间区域的共振W/Z玻色子，我们解决的$\mathcal{O}(α_sα)$修正的框架内展开的W/Z极点。在所谓的极点近似中，只保留主要的共振贡献，校正可以分为可因子化和不可因子化的贡献。本文回顾了我们对“初末”型因子化修正所引起的数值优势修正的计算，即它们把对产生的QCD修正和对W/Z玻色子衰变的大的电弱修正结合起来。此外，我们比较我们的结果更简单的近似组合的电弱和QCD校正的基础上天真的产品的NLO QCD和电弱校正因子，并使用领先的对数近似QED最终状态辐射。最后，我们估计了由$\mathcal{O}(α_sα)$对横向质量分布的修正引起的W玻色子质量的变化。

英文摘要：

Apart from the well-known NNLO QCD and NLO electroweak corrections to W- and Z-boson production at hadron colliders, the most important fixed-order corrections are given by the mixed QCD-electroweak corrections of $\mathcal{O}(α_sα)$. The knowledge of these corrections is of particular importance to control the theoretical uncertainties in the upcoming high-precision measurements of the W-boson mass and the effective weak mixing angle at the LHC. Since these observables are dominated by the phase-space regions of resonant W/Z bosons, we address the $\mathcal{O}(α_sα)$ corrections in the framework of an expansion about the W/Z poles. Retaining only the leading, resonant contribution in the so-called pole approximation, the corrections can be classified into factorizable and non-factorizable contributions. In this article we review our calculation of the numerically dominant corrections which arise from factorizable corrections of "initial-final" type, i.e. they combine the QCD corrections to the production with the large electroweak corrections to the decay of the W/Z boson. Moreover, we compare our results to simpler approximate combinations of electroweak and QCD corrections based on naive products of NLO QCD and electroweak correction factors and using leading-logarithmic approximations for QED final-state radiation. Finally, we estimate the shift in the W-boson mass that results from the $\mathcal{O}(α_sα)$ corrections to the transverse-mass distribution.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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